IMF Managing Director Lagarde participates in an IMF-World Bank discussion during the 2015 Annual Meetings of the IMF and the World Bank in Lima Thomson Reuters Washington (AFP) - The IMF on Sunday defended negative interest rates set by central banks, given "significant risks" of slow growth, while acknowledging potential for dangerous boom-and-bust cycles.

Six central banks, notably the European Central Bank and the Bank of Japan, have taken the unprecedented measure, aimed at loosening the reins on credit to help spur consumer spending and investment.

"Although the experience with negative nominal interest rates is limited, we tentatively conclude that overall they help deliver additional monetary stimulus and easier financial conditions," three top officials at the International Monetary Fund wrote in a blog.

It comes ahead of the IMF's annual Spring Meetings this week in Washington.

While in theory the concept should work, economists are closely studying what happens in Europe and Japan amid worries that negative rates could actually provoke businesses and consumers to be more cautious about spending.

The three IMF officials also had words of caution.

"Negative interest rates may induce boom and bust cycles in asset prices. These potential risks require close monitoring and supervisory scrutiny," they said.